Retrieves the index of the first character of a given line. This method is not supported by System.Windows.Forms.MaskedTextBox.
This method will always return 0.
The MaskedTextBox.GetFirstCharIndexFromLine(int) method is inherited from the base System.Windows.Forms.TextBoxBase class. However, because the System.Windows.Forms.MaskedTextBox control does not support multiline configuration, this method is not supported.